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Once missing in action, middleweight black holes have finally been detected. Now researchers are trying to figure out how they grow from small ones.
Subtle aberrations in the clockwork blinking of stars could become “the result of the century.” That’s if the distortions are produced by a network of giant filaments left over from the birth of the universe.
It was an old idea of Stephen Hawking’s: Unseen “primordial” black holes might be the hidden dark matter. A new series of studies has shown how the theory can work.
Sometimes a mirror that reflects 99.9999% of light isn’t good enough.
A recent neutron star merger has defied astronomers’ expectations, leading them to question longstanding ideas about neutron stars and the supernovas that create them. “We have to go back to the drawing board.”
Two independent papers vanquish lingering doubts about LIGO’s historic discovery of gravitational waves.